package com.hong.shiro.config;

import com.hong.shiro.entity.User;
import com.hong.shiro.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * @author xiehongwei
 * @date 2022/02/11
 */
public class UserRealm extends AuthorizingRealm {

    @Autowired
    private UserService userService;

    /**
     * 授权逻辑  
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection arg0) {
        System.out.println("执行授权逻辑");
        //给资源进行授权
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

        //获取当前用户
        Subject subject = SecurityUtils.getSubject();

        User user = (User) subject.getPrincipal();

        //到数据库查询当前登录用户的授权字符串，通过当前登录用户id查找的数据库用户
        User dbUser = userService.findById(user.getId());

        //添加资源的授权字符串
        info.addStringPermission(dbUser.getPerms());
        return info;
    }

    /**
     * 认证逻辑
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken arg0) throws AuthenticationException {
        System.out.println("执行认证逻辑");
        //编写shiro判断逻辑，判断用户名和密码
        //1. 判断用户名
        UsernamePasswordToken token = (UsernamePasswordToken) arg0;
        User user = userService.findByUsername(token.getUsername());
        if (user == null) {
            //用户名不存在shiro底层会抛出UnknownAccountException
            return null;
        }
        //2. 判断密码,参数1：需要返回给login方法的数据；参数2：数据库密码，shiro会自动判断
        return new SimpleAuthenticationInfo(user, user.getPassword(), "");
    }

}
